Verbseoul.
하다 verb (adj)
강력하다gangryeokhadato be strong or powerful

To say to be strong or powerful politely in the present tense, use 강력해요 (gahng-nyuh-kae-yoh). Below is the full conjugation of 강력하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
강력해
gahng-nyuh-kae
강력해요
gahng-nyuh-kae-yoh
강력합니다
gahng-nyuh-kahm-nee-dah
Past
강력했어
gahng-nyuh-kae-ssuh
강력했어요
gahng-nyuh-kae-ssuh-yoh
강력했습니다
gahng-nyuh-kae-sseum-nee-dah
Future
강력할 거야
gahng-nyuh-kahl- -guh-yah
강력할 거예요
gahng-nyuh-kahl- -guh-yae-yoh
강력할 겁니다
gahng-nyuh-kahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
강력하세요
gahng-nyuh-kah-sae-yoh
Suggestion / Let's Polite (요)
강력해요
gahng-nyuh-kae-yoh
Question Polite (요)
강력해요?
gahng-nyuh-kae-yoh-?
Connective “and” — (고)
강력하고
gahng-nyuh-kah-goh
Conditional “if” — (면)
강력하면
gahng-nyuh-kah-myuhn
Noun form — (기)
강력함
gahng-nyuh-kahm